Although not all wonderkids fulfill their potential and become great players, I have brought a list of best 10 young full-backs to buy on FM17 who have the highest potential:

Felix Passlack (18)

Nationality: Germany

Club: Borrusia Dortmund

Position: Right-Back

Estimated Value (In Euros): 12.5 mil

Felix Passlack is a German professional footballer who plays as a full-back for Borussia Dortmund. On 2 March 2016, Passlack made his professional debut in the Bundesliga in a 2–0 win against SV Darmstadt 98. He also played in a 3–1 win against FC Augsburg and a 3–0 win during the 2015–16 season.

Kieran Tierney (19)

Nationality: Scotland

Club: Celtic

Position: Left-Back

Estimated Value (In Euros): 2 mil

Kieran Tierney is a Scottish footballer who plays for Scottish Premiership side Celtic and the Scotland national football team as a defender. Tierney received his first call-up to the senior Scotland squad on 10 March 2016 for a friendly against Denmark. Tierney played for the first half of the match, which Scotland won 1–0 at Hampden Park; he was replaced at the break by his Celtic teammate Charlie Mulgrew.

Timothy Fosu-Mensah (18)

Nationality: Netherlands

Club: Manchester United

Position: Left-Back/Central

Estimated Value (In Euros): 12.75 mil

Timothy Fosu "Tim" Fosu-Mensah is a Dutch professional footballer who plays as a defensive midfielder, centre-back or full-back for English club Manchester United. He is the brother of North Ferriby United player Alfons Fosu-Mensah. Fosu-Mensah has played for Manchester United's youth teams in a variety of positions, including centre-back, left-back and central midfield. He made his professional debut at left-back on 28 February 2016 in a 3–2 Premier League win at home to Arsenal, coming on as a 55th-minute substitute for Marcos Rojo.

Joe Gomez (19)

Nationality: England

Club: Liverpool

Position: Left-Back/Right-Back/Central

Estimated Value (In Euros): 6.7 mil

Joseph Dave "Joe" Gomez is an English professional footballer who plays for Premier League club Liverpool. Gomez prefers to play as a centre-back but can also play as a full-back on either side. Gomez has been described as a complete footballer and composed ball-playing centre back with his style of play being compared to that of Rio Ferdinand whom he idolised growing up. Gomez is also noted for his athleticism and strength; he is able to produce powerful and dangerous runs up-field on the counter-attack and in defence is rarely physically dominated by an opponent.

Pol Lirola (19)

Nationality: Spain

Club: Sassuolo (on loan from Juventus)

Position: Right-Back

Estimated Value (In Euros): 750K

Pol Mikel Lirola Kosok is an Spanish footballer who plays as right-back for Serie A club Sassuolo, on loan from Juventus. After beginning his career in the Espanyol youth system, making his club debut in the Spanish third division in 2014, Lirola was sent on loan to Juventus in January 2015, where he joined the club's youth side. During the summer session of the transfer market later that year, Juventus bought Lirola outright.

Jorge (20)

Nationality: Brazil

Club: Flamengo

Position: Left-Back

Estimated Value (In Euros): 2.5 mil

Jorge Marco de Oliveira Moraes, simply known as Jorge, is a Brazilian footballer who plays for Brazilian Série A club Flamengo as a left back. He is also a member of Brazil U20 team. Jorge made his Série A debut on 1 July 2015, starting in a 1–0 away win against Joinville. He subsequently overtook new signing Pablo Armero as first-choice, and renewed his contract for a further two years on 6 September.

Pedro Pereira (18)

Nationality: Portugal

Club: Sampdoria

Position: Right-Back/Left-Back

Estimated Value (In Euros): 1.75 mil

Pedro Miguel de Almeida Lopes Pereira is a Portuguese footballer who plays as a right back for Italian club Sampdoria in Serie A. Pedro Pereira joined Sampdoria in 2015 from Benfica. He made his Serie A debut on 14 September 2015 against Bologna.

Lukas Klostermann (20)

Nationality: Germany

Club: RB Leipzig

Position: Right-Back/Central

Estimated Value (In Euros): 6.15 mil

Lukas Klostermann is a German footballer who plays as a defender for RB Leipzig. On 22 August 2014, it was announced that Klostermann would transfer to RB Leipzig. He signed for Leipzig on a four-year deal until 2018. He was also part of the squad for the 2016 Summer Olympics, where Germany won the silver medal.

Almamy Toure (20)

Nationality: Mali

Club: AS Monaco

Position: Right-Back/Central

Estimated Value (In Euros): 3.2 mil

Touré is a youth exponent from AS Monaco. He made his league debut on 20 February 2015 in a 0-1 away win against OGC Nice. He replaced Layvin Kurzawa after 35 minutes. Bernardo Silva scored the only goal of the game. He played his first game as a starter on 25 February 2015, during Monaco's surprise 1-3 win against Arsenal F.C at the Emirates Stadium. Touré signed a new four-year contract with Monaco on 19 May 2015.

Kevin Diks (20)

Nationality: Netherlands

Club: Fiorentina

Position: Right-Back/Central

Estimated Value (In Euros): 725K

On 6 July 2016, Diks joined Serie A side Fiorentina on a five-year deal after impressing at Vitesse. On 23 October 2016, three months after signing for the Italian side, Diks finally made his long-awaited debut in a 5–3 away victory against Cagliari, replacing Cristian Tello in the 88th minute.